<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <script type="text/javascript" src="../js/vue.js"></script>
  </head>
  <body>
    <div id="root">
      <h2>人员列表</h2>
      <input type="text" placeholder="请输入名字" v-model="keyWord" />
      <button @click="sortType=2">年龄升序</button>
      <button @click="sortType=1">年龄降序</button>
      <button @click="sortType=0">原顺序</button>
      <ul>
        <li v-for="(val,ind) in filledPersons" :key="val.id">{{val.id}} {{val.name}} {{val.age}}</li>
      </ul>
    </div>
    <script type="text/javascript">
      Vue.config.productionTip = false;

      const vm = new Vue({
        data: {
          keyWord: "",
          sortType: 0, //0 原顺序 1降序 2升序
          persons: [
            { id: "001", name: "马冬梅", age: 18, sex: "女" },
            { id: "002", name: "周冬雨", age: 19, sex: "女" },
            { id: "003", name: "周杰伦", age: 25, sex: "男" },
            { id: "004", name: "妖伦", age: 25, sex: "男" },
          ],
        },
        computed: {
          filledPersons: {
            get() {
              const arr = (this.persons.name = this.persons.filter((p) => {
                return p.name.indexOf(this.keyWord) !== -1;
              }));
              if (this.sortType) {
                arr.sort((p1, p2) => {
                  return this.sortType == 1 ? p2.age - p1.age : p1.age - p2.age;
                });
              }
              return arr; // 如果是 0原顺序，读取filledPersons时就跳过了排序环节，得到了没被排序的原persons（但过滤还在）
            },
          },
        },
      });
      vm.$mount("#root");
    </script>
  </body>
</html>
